CVE-2014-0769 in CECX-X-M1 Modular Controller
Summary
by MITRE
The Festo CECX-X-C1 Modular Master Controller with CoDeSys and CECX-X-M1 Modular Controller with CoDeSys and SoftMotion do not require authentication for connections to certain TCP ports, which allows remote attackers to (1) modify the configuration via a request to the debug service on port 4000 or (2) delete log entries via a request to the log service on port 4001.
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Analysis
by VulDB Data Team • 07/03/2025
The Festo CECX-X-C1 Modular Master Controller and CECX-X-M1 Modular Controller with CoDeSys and SoftMotion represent industrial automation devices that incorporate embedded systems designed for manufacturing and process control environments. These controllers operate within critical infrastructure sectors where security is paramount, yet they exhibit significant authentication weaknesses that expose them to remote exploitation. The vulnerability stems from the controllers' failure to implement proper access controls for specific TCP ports, creating pathways for unauthorized remote access that could compromise operational integrity and safety protocols.
The technical flaw manifests in the controllers' lack of authentication mechanisms for two specific TCP ports: port 4000 dedicated to the debug service and port 4001 designated for the log service. This absence of authentication creates a direct attack vector where remote adversaries can establish connections without proper credentials, allowing unrestricted access to critical system functions. The debug service on port 4000 provides access to configuration modification capabilities, while the log service on port 4001 enables deletion of system logs, both of which represent severe operational risks in industrial control systems. This vulnerability aligns with CWE-305 authentication bypass issues and represents a fundamental failure in implementing defense-in-depth principles for industrial control systems.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially enabling adversaries to compromise industrial processes and operational continuity. Attackers could modify controller configurations to alter production parameters, disrupt manufacturing processes, or create system instability that might result in physical damage to equipment or safety hazards. The ability to delete log entries particularly undermines security monitoring and incident response capabilities, as it removes crucial audit trails that would normally be available for forensic analysis. This vulnerability directly impacts the CIA triad by compromising confidentiality through unauthorized log deletion, integrity through configuration modification, and availability through potential process disruption.
Organizations utilizing Festo controllers should implement immediate network segmentation strategies to isolate these devices from general network access, ensuring that only authorized personnel can reach the vulnerable TCP ports through secure channels. Network access control lists should be configured to restrict access to ports 4000 and 4001 to specific trusted IP addresses only, while implementing robust network monitoring to detect unauthorized access attempts. Device firmware updates should be prioritized to address the authentication gaps, and administrators should conduct thorough network audits to identify all instances of these controllers within their infrastructure. The vulnerability also highlights the importance of following industrial security frameworks such as NIST SP 800-82 and IEC 62443 standards, which emphasize the need for secure configuration management and access control in industrial environments. Additionally, implementing network intrusion detection systems specifically configured to monitor for suspicious activity on these vulnerable ports can provide early warning capabilities for potential exploitation attempts.